This Radiant 20,000 BTU Natural Gas Vent Free heater is the perfect supplemental heating solution, even on the coldest days. This heater is conveniently equipped with a thermostat for superior control of the temperature in your space. Also, with a battery powered electronic ignition, starting it is a breeze battery included. This unit can be permanently mounted to the wall or securely fastened to the floor with included mounting brackets and fasteners. Multiple burner tiles utilize radiant heat, warming your space with the power of the sun. With a factory standard Oxygen Depletion Sensor (ODS), rest assured this heater will provide you with years of comfortable and safe heat. Heats up to 700 sq ft Radiant heat burner Thermostat for automatic temperature control Automatic low oxygen shut-off system (ODS)